void solve2() {
typedef set<int, cmp_height> set_t;
static vector<Event> event;
static set_t box;
static stack<int> stk;
static vector<int> seq;
static int dgr[N_MAX];
static vector<int> adj[N_MAX];
for ( int i = 0; i < n_stuff; i ++ ) {
event.push_back(Event(stuff[i].x1, i, ENTER));
event.push_back(Event(stuff[i].x2, i, LEAVE));
}
sort(event.begin(), event.end(), cmp_event);
for ( vector<Event>::iterator ev = event.begin();
ev != event.end(); ev ++ ) {
if ( ev->typ == ENTER ) {
pair<set_t::iterator, bool> res = box.insert(ev->id);
set_t::iterator it = res.first;
it ++;
if ( it != box.end() ) {
dgr[*it] ++;
adj[ev->id].push_back(*it);
//fprintf(stderr, "%d->%d\n", ev->id, *it);
}
it --;
if ( it != box.begin() ) {
it --;
dgr[ev->id] ++;
adj[*it].push_back(ev->id);
//fprintf(stderr, "%d->%d\n", *it, ev->id);
}
} else
box.erase(box.lower_bound(ev->id));
}
for ( int i = 0; i < n_stuff; i ++ )
if ( dgr[i] == 0 )
stk.push(i);
while ( !stk.empty() ) {
int u = stk.top(); stk.pop();
seq.push_back(u);
for ( vector<int>::iterator it = adj[u].begin();
it != adj[u].end(); it ++ ) {
int v = *it;
dgr[v] --;
if ( dgr[v] == 0 )
stk.push(v);
}
}
assert((int)seq.size() == n_stuff);
for ( int i = 0; i < n_stuff; i ++ )
printf("%d %d\n", seq[i] + 1, 3);
}
void build_graph() {
for ( int i = 0; i < n_stuff; i ++ ) {
event.push_back(Event(stuff[i].x1, i, ENTER));
event.push_back(Event(stuff[i].x2, i, LEAVE));
}
sort(event.begin(), event.end(), cmp_event);
axis = 0;
for ( int i = 0; i < 2 * n_stuff; i ++ ) {
int st = i;
while ( i + 1 < 2 * n_stuff &&
event[i + 1].x == event[i].x )
i ++;
for ( int k = st; k <= i; k ++ ) {
int t = event[k].id;
if ( event[k].typ == ENTER )
stuff[t].l = axis;
else
stuff[t].r = axis;
}
axis ++;
}
for ( vector<Event>::iterator ev = event.begin();
ev != event.end(); ev ++ ) {
if ( ev->typ == ENTER ) {
pair<set_t::iterator, bool> res = box.insert(ev->id);
set_t::iterator it = res.first;
it ++;
if ( it != box.end() ) {
dgr[*it] ++;
adj[ev->id].push_back(*it);
}
it --;
if ( it != box.begin() ) {
it --;
dgr[ev->id] ++;
adj[*it].push_back(ev->id);
}
} else {
set_t::iterator it = box.lower_bound(ev->id);
box.erase(it);
}
}
}